Applications of corona treatment

Generally, the surfaces of plastics have low energy and are chemically inert. Because of these properties, the surfaces have poor coatability with coatings, printing inks, etc. Secondary processing of plastic films therefore requires their surface modification.
Corona treatment applies a polar functional group to the material surface to improve its hydrophilic property, thereby preventing coating and printing failures.
Recent years have seen the emergence of many functional films with small surface energy, making it more important to apply corona treatment in the converting process. This has led to the expansion of corona treatment into new technologies, a typical example of which is gas plasma treatment.
Properties of corona discharge treatment have also been applied for other purposes, including oil film removal from metallic foils, anti-fog treatment of plastic boards, etc., and facilitation of surface bleeding of additives.